#page{
  max-width: 750px;
  margin: 0 auto;
  .btn{
    width:6rem;
    height:1rem ;
    font-size:22px;
    position: fixed;
    bottom: 0.24rem;
    left: 50%;
    transform:translateX(-50%);
    border-radius: 50px;
    background: @red;
    color:#fff;
    z-index: 2;
  }
}



